Combustion chamber air feed means



A15141414, 1936. F. w. SCHEIFELE 2,037,598

COMBUSTION CHAMBER AIR FEED MEANS Original Filed l pril 23, 1932 V 2Sheets-Sheet l A ril 14, 1936. F. w. SCHEIFELE- COMBUSTION CHAMBER AIRFEED MEANS Original Filed April 25, 1952 2 Sheets-Sheet 2 Patented Apr.14, 1936 UNITED STATES PATENT OFFICE Original application April 23,1932, Serial No.

607,141. Divided and this application November 28, 1934, Serial No.755,222

9 Claims.

' This invention relates to the class of heating structures,particularly fluid fuel burning furnaces, and pertains especially to airfeeding means therefor, and the present application constitutes adivision of application, Ser. No. 607,141,

filed April 23, 1932.

The primary object of the present invention is to provide an improvedmechanism for feeding air to furnaces employing fluid fuel whereby aminimum of noise is developed and the combustion of the fuel is moreevenly obtained. Another object of the invention is to provide an airsupplying mechanism for furnaces wherein a novel aperture constructionis employed which stratifies the air blast and effects an evenerdispersion of the fuel so that the maximum of heating efiiciency isobtained therefrom.

The invention has for a further object the provision of an air feedingmechanism in which the discharge aperture is provided with bafllingelements which act to stratify the air currents and, in addition toobtaining a more efiicient combustion of the fuel, effect a reduction inthe noise incident to discharging the air directly into the combustionchamber.

The invention will be best understood from a consideration of thefollowing detailed description taken in connection with the accompanyingdrawings forming part of this specification, with the understanding,however, that the invention is not confined to any strict conformitywith the showing of the drawings but may be changed or modified so longas such changes or modifications mark no material departure from thesalient features of the invention as expressed in the ap pended claims.

In the drawings:

. Figure 1 is a view in top plan of the air feeding mechanism embodyingthe present invention.

a Figure 2 is a view in rear elevation of the same.

Figure 3 is a view in side elevation of the mechanism showing the samecoupled up with a furnace.

Figure 4 is a sectional view taken substantially upon the line 4-4 ofFigure 3.

Figure 5 is a sectional view taken upon the line 5-5 of Figure 4.

Figure 6 is a view looking into the air discharge opening at the joinedends of the air conduits from the plane of separation between the deviceand the mouth of the combustion chamber indicated by the line 6 6 ofFigure 1.

- Referring to the drawings, the air feeding means constituting thepresent invention comprises a base structure I which is mountedhorizontally upon suitable supports such as the standards 2. Secured toor forming a part of this base are spaced fan housings 3 which haveapertured air inlet plates 4 upon their remote sides and which join attheir outlets 5 with air conducting 5 conduits 6.

Disposed upon the supporting base I between the fan housings 3 is anelectric motor I, the armature shaft of which is extended from its twoends through the axial centers of the housings 3 10 to form the fanshafts 8. Each of these fan shafts 8 carries within a housing 3 the fanblades 9 which draw air in through the apertured plates 4 and dischargeit into the conduits 6, when the motor is operated. V

Mounted upon the outer end of each shaft 8 is a plate III which isadapted to be shifted longitudinally on the shaft and held in adjustedpositionby a nut II. By adjusting these plates ID, the amount of airdrawn into the fan housings 20 through the apertured plates 4 may becontrolled.

' The conduits-6 extend from the fan housings 3 in convergent relation,as illustrated in Figures 1 and 4, and join at their outer ends fordischarge through a common outlet I2. In setting up the 5 device foruse, the converged ends of the conduits are disposed against the usualfuel charging opening or mouth l3 of the furnace M in association withwhich the mechanism is to be used, and suitable sealing means isemployed between the fuel 30 receiving mouth of the furnace and the airdischarge ends of the conduits to prevent the escape of the injected airfrom these conduits or from the furnace.

At the outer side of the discharge end of each 35 air conduit 6, or ateither side of the common air outlet opening 12 which is formed byjoining the ends of these conduits, there are formed a plurality ofinwardly projecting fingers I5. These fingers at each side of theopening are divided into 40 two groups, one of which is set in advanceof the other and the fingers of each group are in vertically spacedrelation. In addition to being vertically spaced, the fingers of onegroup are disposed in horizontal planes passing through the 45 spacesbetween the fingers of the adjacent group and further, the fingers ofthe two groups at one side of the air inlet passages are arranged to liein horizontal planes passing through the spaces between the fingers ofthe two corresponding 50 groups upon the opposite side.

As is illustrated in Figure 4, the sides of the fingers against whichthe air impinges as it passes along the conduits are concaved and, asillustrated in Figure 5, the fingers are relatively broad 55 and alsoare slightly channeled or transversely concave. With this construction,the column of air discharged through each conduit in coming into contactwith the fingers at the outlet ends of the conduits, will be deflectedtoward the opposite side of the air discharge opening in strata whichwill oppose the strata formed by the opposite group and thus cause athorough distribution of the air in the combustion chamber of thefurnace.

The numeral 96 indicates a fuel discharge nozzle which is disposed atthe center of the air discharge opening with its outlet endsubstantially in the vertical plane of this outlet. It will thus be seenthat the air sheets or strata will flow across the outlet end of thefuel nozzle and thus, as the fuel will be directed straight inwardlyfrom the nozzle, the cross currents formed will effect the distributionof the fuel through the entire combustion chamber of the furnace andinsure the complete combustion of the same.

The area between the convergent ends of the air conduit 6 is closed topand bottom, as illustratedin Figures 1 and 3, so that the air cannotescape at the point to where the fuel nozzle enters the fuel inlet ofthe furnace.

The fuel feed mechanism here illustrated constitutes the subject-matterof the prior application previously referred to and plays no part in theoperation of the present air feeding mechanism insofar as the method ofsupplying the fuel to the nozzle 56 is concerned.

What is claimed is:

1. Means for supplying fluid fuel and air to a combustion chamberthrough a fuel inlet opening comprising a pair of air conduits havingoutlet ends joined in convergent relation to form a common outlet, afluid fuel nozzle disposed centrally of said common outlet, means fordriving air under pressure through said conduits, and a plurality ofvertically spaced baffle fingers at each side of said common opening andprojecting inwardly, said fingers being concave longitudinally of thefaces against which the air impinges and further being transverselyconcave on said faces and the fingers upon one side of the opening beingdisposed in the planes of the spaces between the fingers on the otherside of the opening.

2. Means for feeding fluid fuel and air to a combustion chambercomprising convergently related air conduits, the convergent ends ofsaid conduits being joined to form a common air discharge opening, meansfor discharging air under pressure through said conduits, a plurality ofgroups of vertically spaced baflle fingers disposed at each side of saidcommon air discharge opening and extending inwardly from the side of thesame on which they are located, said groups of fingers upon each side ofthe opening being disposed one ahead of the other and the fingers of onegroup being disposed in the planes of the spaces between the fingers ofthe other group, the fingers of said groups being formed upon the facesagainst which the air impinges to cause the air to be deflected acrossthe said openings, and a fluidfuel nozzle disposed centrally of the airdischarge opening and between the ends of the said baffle fingers.

3. Means for supplying fluid fuel and air to a combustion chamber,comprising a structure having a discharge opening designed to bedirected into thecombustion chamber, means for supplying air underpressure to the structure for discharge through said opening, a fluidfuel nozzle disposed in said opening for discharge into the chamber, anda series of vertically spaced air baflie fingers at each side of thedischarge opening and each extending transversely thereof from theadjacent side to a point short of the center of the opening, and sodisposed relative to the nozzle whereby air deflected from the fingersintersects the fluid jet adjacent its point of discharge from thenozzle.

4. Means for supplying fluid fuel and air to a combustion chamber,comprising a structure having a discharge opening designed to bedirected into the combustion chamber, means for supplying air underpressure to the structure for discharge through said opening, a fluidfuel nozzle disposed in said opening for discharge into the chamber, anda series of vertically spaced bafile fingers at each side of thedischarge opening and directed transversely of the same, said fingershaving the faces against which the air impinges, longitudinally concave,and the fingers being so disposed relative to the nozzle whereby'airdeflected from the fingers intersects the fluid jet adjacent its pointof discharge from the nozzle.

5. Means for supplying fluid fuel and air to a combustion chamber,comprising a structure having a discharge opening designed to bedirected into the combustion chamber, means for supplying air underpressure to the structure for discharge through said opening, a fluidfuel nozzle disposed in said opening for discharge into the chamber, anda series of vertically spaced bafil'e fingers at each side of thedischarge opening and directed transversely of' the same, said fingershaving the faces against which the air impinges, longitudinally andtransversely concave, and the fingers being so disposed relative to thenozzle whereby air deflected from the fingers intersects the fluid jetadjacent its point of discharge from the nozzle.

6. Means for supplying fluid fuel and, air to acombustion chamber,comprising a structure having a discharge opening designed to be,directed into the combustion chamber, means for supplying air underpressure to, the structure for discharge through said opening, a fluidfuel: nozzle disposed in said opening for discharge into the chamber,and two groups of baflle fingers, each group. being disposed at one sideof the discharge opening and comprising two series of fingers, oneseries being in advance of the other and each series having the fingersvertically spaced, one series of each group beingarranged in planespassing between the other series of thesame group, and the fingers ofthe series of both groups being directed transversely of the opening,and said, fingers being so disposed relative to the nozzle whereby airdeflected from the fingers intersects the fluidjet adjacent its point ofdischarge from the nozzle.

7. Means for supplying fluid fuel, and air tov a combustion chamberthrough a fuel inlet opening, comprising an air conducting structurehaving an outlet directed toward said, fuel inlet opening, a fuel feednozzle disposed centrally of the opening, means for driving air underpressure through said structure, and a plurality of. vertically spacedbaflle fingers at each side ofsaidopening andprojecting inwardly towardbut terminating short of the center thereof, the said fingers upon oneside of the opening being disposed in the planes of the spaces betweenthe fingers on the other side of the opening.

8. Means for supplying fluid fuel. and air to a combustionphamber,comprising a structure having a discharge opening designed; to bedirected intothe combustion chamber, meansfor supplying air underpressure to the structure for discharge through said opening, a fluidfuel nozzle disposed in said opening for discharge into the chamber, andtwo groups of baffle fingers, each group being disposed at one side ofthe discharge opening and comprising two series of fingers, one seriesbeing in advance of the other and each series having the fingersvertically spaced, one series of each group being arranged in planespassing between the other series of the same group, the fingers of theseries of both groups being directed transversely of the opening, andthe fingers of each series of one group being disposed in planes passingbetween the fingers of the corresponding series of the other group, saidfingers also being so disposed relative to the nozzle whereby airdeflected from the fingers intersects the fluid jet adjacent its pointof discharge from the nozzle.

9. Means for supplying fiuid fuel and air to a combustion chamberthrough a fuel inlet opening, comprising an air conducting structurehaving an outlet directed toward said fuel inlet opening, a fuel feednozzle disposed centrally of the opening, means for driving air underpressure through said structure, and a plurality of vertically spacedbaflie fingers at each side of said opening and projecting inwardly,said fingers being concave longitudinally of the faces against which theair impinges and the fingers upon one side of the opening being disposedin the planes of the spaces between the fingers on the other side of theopenings.

FREDERICK W. SCHEIFELE.

